Host memory consumption is higher than the comments its use (incl. Cached) and overhead?

I'm under ESXi 5.1. I don't have any custom reserve configured for memory. I'm running in CVS 'Sandy Bridge' mode.

I noticed earlier than expected host memory consumed on many of my guests. This example comments running Server R2 2012 with the latest version of VMware tools running.

VMware reports

VM-Resource-Memory.PNG

The guest operating system reports

VM-GuestOS-Memory.PNG

My understanding is that the "Standby" and "Modified" on the client contains the ' cache ', and the 'Cached' memory prompt is the typical response to this question that I see when people seek only to the memory of 'In Use'. In my case, I'm factoring in the memory cache, my guest shows 3805 MB of real memory, yet my host shows 7.68 GB of memory consumed host, with only 68 MB of general consumption. According to my calculations, the virtual machine should be only consume about 4.28 GB of memory.

Post edited by: bradduane Replace the values of text with screenshots.

I think I found my answer in the guide 'Understanding memory resources management' here: http://www.vmware.com/files/pdf/mem_mgmt_perf_vsphere5.pdf

Section "when to retrieve memory host" page 15:

«In the high State, the use of global memory machine virtual comments is smaller than the size of the host memory.» Whether or not the host memory is overcommitted, the hypervisor will not recover memory via hot-air balloon or permutation. (It is true that when the limit memory VM is not set).

If memory free host down to the low threshold, the hypervisor begins to find the memory using the balloon. Balloon happens before free memory has actually reached the soft threshold because it takes time for the balloon pilot to allocate and PIN memory physics reviews. Usually, the balloon pilot is able to retrieve the memory in a timely order to keep free memory in the host above the soft line. »

I checked esxtop, pressing "m" for the display of the memory, and I see that hosts VMKMEM shows 'State', so the only memory of way either currently retrieved is by sharing the page. Only when I start to run out of memory of the host, that this State becomes 'soft' or 'hard', balloon or Exchange will be held in order to free the "free" memory of comments. ESXTOP show my 'minfree"than 940 MB, while it shows that I physically 6960MB of free memory.

Tags: VMware

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